This may be a midlands expression, I have no idea... the practice of counting up the coppers in order to create useful sums of money.
Today I have coppered up more than a decade's worth of coppers (and silver) that has lain in my house in assorted draws, jars, tins, bowls etc... and the total was just under £48. Rounded up to £50 it makes a decent contribution to the cause I have selected and had, effectively cost me nothing.
One jar of copper coins dated back to the time I was a student in Manchester and money was tight. I popped coppers into a jar so that I would have money for treats for godsons or nephews/nieces who came to visit to buy ice-creams. Given one of the godsons got married a fornight ago, I reckon its use is past!
Very chuffed to have discovered £50 of "dead" money and put it to work for the Kingdom of God!